<?php

class Mageex_ExportPdf_Model_Mysql4_ExportPdf extends Mage_Core_Model_Mysql4_Abstract
{
    public function _construct()
    {    
        // Note that the exportpdf_id refers to the key field in your database table.
        $this->_init('exportpdf/exportpdf', 'exportpdf_id');
    }
}